Analyze PostgreSQL and MySQL execution plans, detect unindexed sequential scans, and estimate query latency.
Execution runs 100% locally inside the browser sandbox using HTML5 Canvas, Web Cryptography Subtle API, and Web Workers. Zero egress.
Zero network latency. Operates completely offline with zero dependencies on third-party backend servers or cloud services.
Built according to official RFC specifications, cryptographic test vectors, and enterprise-grade data transformation standards.
Run EXPLAIN ANALYZE on your SQL database and paste the text plan.
Review detected execution nodes (Seq Scan, Index Scan, Joins) and execution latency.
Identify unindexed filter columns and optimize query predicates.
EXPLAIN shows the database query planner's estimated cost without running the query, while EXPLAIN ANALYZE actually executes the query to return real timing and row counts.
A sequential scan reads every single disk block in the table, which causes high I/O latency and degrades database throughput without an index.
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